The study was conducted at a computer laboratory at the Department of Physiology, Faculty of Medicine, University of Niš. The subjects were tested on three consecutive days between 8 and 10 AM, and all participants were randomly divided into three groups of 12.

The test battery consisted of the following tasks:

Corsi blocks test. The subjects were presented with a screen containing nine dark squares and each square lit up in a sequence. The subjects were instructed to remember the order in which the squares were lit, and after the sequence was completed, they were to select the squares in the order they lit up [22]. Each task took approximately 5 minutes

Forward digit span. The subjects were presented with a series of numbers, which, after every correct answer, increased in its length, and were required to immediately repeat them back. Longer series of numbers were presented to subjects until they could no longer repeat them back correctly [22]. The task took five minutes to complete

Speeded tapping/oscillation task. Subjects were instructed to tap the space button on a keyboard with their dominant hand index-finger for as many times as they could during 60 secs. After each test period, the results for the previous test were shown on the screen during the 10 sec break period. The test consisted of 3 consecutive sessions

Simple response time. Subjects were presented with a signal (letter X) following an irregular time pattern (250 to 2500 ms) and were instructed to react (press a button on the keyboard) as soon as they see the stimulus. The test was comprised of 4 blocks of 50 trials and it took around 6 min to finish.

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